RouterInstallerTestHooks.php

<?php

declare (strict_types=1);
namespace Drupal\router_installer_test\Hook;

use Drupal\Core\Url;
use Drupal\Core\Hook\Attribute\Hook;

/**
 * Hook implementations for router_installer_test.
 */
class RouterInstallerTestHooks {
    
    /**
     * Implements hook_modules_installed().
     */
    public function modulesInstalled($modules) {
        if (in_array('router_installer_test', $modules, TRUE)) {
            // Ensure a URL can be generated for routes provided by the module during
            // installation.
            \Drupal::state()->set('router_installer_test_modules_installed', Url::fromRoute('router_installer_test.1')->toString());
        }
    }

}